Gravitropic response and circumnutation in pea (Pisum sativum) seedling roots

Hye jeong Kim, Akie Kobayashi, Nobuharu Fujii, Yutaka Miyazawa, Hideyuki Takahashi

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

Plant circumnutation is a helical movement of growing organs such as shoots and roots. Gravitropic response is hypothesized to act as an external oscillator in shoot circumnutation, although this is subject to debate. The relationship between circumnutational movement and gravitropic response in roots remains unknown. In this study, we analyzed circumnutation of agravitropic roots using the ageotropum pea (Pisum sativum) mutant, and compared it with that of wild-type (cv. Alaska) pea roots. We further examined the relationship of gravitropic response to circumnutation of Alaska seedling roots by removing the gravisensing tissue (the root cap) and by treating the roots with auxin transport inhibitors. Alaska roots displayed circumnutational movements with a period of approximately 150min, whereas ageotropum roots did not exhibit distinct circumnutational movement. Removal of the root cap in Alaska roots reduced gravitropic response and circumnutational movements. Treatment of Alaska roots with auxin transport inhibitors, 2,3,5-triiodobenzoic acid (TIBA) and N-(1-naphthyl)phthalamic acid (NPA), dramatically reduced gravitropic response and circumnutational movements. These results suggest that a gravity-regulated auxin transport is involved in circumnutation of pea seedling roots.

Original languageEnglish
Pages (from-to)108-118
Number of pages11
JournalPhysiologia Plantarum
Volume157
Issue number1
DOIs
Publication statusPublished - 2016 May 1

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